Gregor the overlander is about a boy and his baby sister who go to a world they never thought excited. In the underland there are huge spiders and other huge rodents. Gregor and his little sister go on a journey to explore the underland and find things the never saw before. Along the way they meet new people animals of unusel size. But before all of that happened Gregor was just a boy waiting for something interesting to happen. Gregor's dad dissaperd one day Gregor wishes he can hug him again. His mom was at work most of the time and Gregor was very lonely.

When gregor and his little sister arrive to the underland things changed. Gregor knows his fauther is alive and he things he might be in the underland Gregor meets people named Vikus, Queen Luxa, Henry.
Vikus is very understanding. He understands Gregor when he needs help and has no one to talk to about it. Vikus is like the leader he knoes whats best and whats safe. Queen Luxa is the the Queen of the underland she only listens to her self. She makes her own disetions. But that might change when Gregor arrives.

Henry helps Gregor with his proplems and trys to fix it. Henry will stand and listen to want Gregor has to say and he will follow orders you give him. But things change and people change. Gregor finds out his dad is in the underland. He had bin capurde by the evil rats.